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Finding the Fourth Proportional to 7,134.42, 9,844.92 and 3,990

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Solution

The fourth proportional to 7,134.42, 9,844.92 and 3,990 is: 5,505.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,134.42 : 9,844.92 = 3,990 : x
  2. Step 2: Convert to fraction form
    7,134.42/9,844.92 = 3,990/x
  3. Step 3: Cross multiply
    7,134.42x = 9,844.92 × 3,990
  4. Step 4: Simplify right side
    7,134.42x = 39,281,230.80
  5. Step 5: Solve for x
    x = 39,281,230.80/7,134.42
  6. Step 6: Final answer
    x = 5,505.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.